Calcined alumina is an alpha-alumina produced to consistently achieve the chemical purity and crystal structure necessary to meet individual ceramic application needs. Almatis offers a large product range of calcined aluminas classified by soda content, particle size, and degree of calcination.
Calcined Alumina Applications
Calcined aluminas are utilized in the production of a wide range of industrial and products:
- Technical & engineered ceramics, such as:
- Thread and wire guides
- Faucet valves
- Wear resistant engine and pump parts
- Sealing rings and bearings
- Armor
- Electronic ceramics:
- Metallized thick and thin film substrates
- High Alumina (+99%) ceramic insulators
- Electrical housings
- Resistor rods and tubes
- Electrical insulation parts
- High voltage insulators
- Spark plugs
- Catalyst supports
- Filter Ceramics
- Chinaware
- Sanitary ware
- Wear resistant ceramics, including grinding media
- Ceramic tiles, frits and glazes
Benefits of Almatis Calcined Aluminas
Processing properties such as:
- Typical high fired densities of typical 3.90 g/cm 3 in finished ceramics parts
- Consistent pressing and slip casting behavior
- Very good green machining properties
- Low sintering temperatures and decreased polishing times reduce customer processing costs
- Tightly controlled shrinkage
Final ceramic product properties such as:
- Defined uniform microstructure
- Very good corrosion resistance
- Excellent mechanical wear resistance and strength
- High dielectric strength
- Good thermal shock resistance
Why Almatis Calcined Aluminas are Premium
- Ensured supply with largest global capacity
- Excellent lot-to-lot consistency for producing highly reliable ceramic products
- All products produced to tight product specifications for optimized processing to guarantee excellent physical, electrical and thermal properties of the advanced ceramics components:
- chemistry
- particle size distribution
- specific surface area/BET
- primary crystal size
- green density
- firing shrinkage
- fired density
- Contaminant-free ground products ensure high performance of ceramic products
- Global technical support offering consulting, troubleshooting and application assessment to optimize ceramic performance
- Products are globally available through expansive worldwide manufacturing, sales and supply
Calcined Alumina Products
Low Soda Calcined Alumina - Na2O ‹ 0.10%
Features:
dense ceramic metrics, consistent shrinkage, high electrical resistance and high thermal conductivity.
| Product | Description |
| CT 1200 | Surface area from 0.9 - 1.1m2/g
Crystal size 1.5-2.3 µ |
| CL 2500 | Surface area from 0.85 - 1.00 m2/g
Crystal size 1.5-2.3 µ |
| CL 3000 | Surface area from 0.55 - 0.70 m2/g
Crystal size 2.0-2.7µ |
| CL 4400 | Surface area from 0.25 - 0.40 m2/g
Crystal size 2.6-5.1 µ |
| CL 5000 | Surface area from 0.20 - 0.35 m2/g
Crystal size 3.1-5.1 µ |
| CT 19 | Surface area between 0.20 - 0.45 m2/g; also available fine ground (‹45µm) |
| A10 | Typical surface area of 0.20 m2/g
Crystal size 4.5-5.3 µ |
| A14 | Typical surface area of 0.55 m2/g
Crystal size 2.4-3.2 µ |
Intermediate Soda Calcined Alumina - Na2O ‹ 0.15%
Features:
High dielectric strength, high mechanical strength, high thermal conductivity and consistent shrinkage.
| Product | Description |
| WRA | Surface area between 0.5 - 0.7 m2/g |
| CT 700 | Unground
Surface area between 0.60 - 0.80 m2/g
Low chemical impurities and tight specification |
| CT 800 | For use in ceramics and refractories
Surface area between 0.65 - 0.85 m2/g
Also available fine ground (‹45 µm) and SG (<20 µm) |
| HVA | Surface area between 0.40 - 0.55 m2/g
Also available fine ground (‹45 µm) |
Medium Soda Calcined Alumina - Na2O ‹ 0.25%
Features:
High dielectric strength, high mechanical strength, high thermal conductivity and consistent shrinkage.
| Product | Description |
| A13 -325 mesh | Medium surface area from 8.0 to 15.0 m2/g, high purity |
| A13 LS | High purity, medium surface area from 6.5 to 15.0 m2/g |
| A35 Unground | Low surface area (‹0.6 - 1.5 max m2/g), available ground or unground |
| A35 -325 |
Normal Soda Calcined Alumina - Na2O ‹ 0.45%
Features:
Provides for consistent surface properties and color. Good grindability guarantees consistent process behavior and defined ceramic properties.
| Product | Description |
| A2 | Low surface area (‹0.6 - 1.5 max m2/g) available ground or unground |
| A2 -325 |
| A2 -325CR |
| SC 13 | High purity, medium surface area 9 - 16 m2/g |
| P30 |
| P730 |
Global Product Data Sheets
European Product Data Sheets
Americas Product Data Sheets
